"puts" output not displaying in Heroku logs for Sinatra app

Question

I'm trying to use "puts" to test a few things with a Sinatra app that's hosted on Heroku. Interestingly, the output seems to queue up and only displays upon restarting the Heroku dyno. I've tried with 'Thin' and 'Webrick', but have the same issue.

Any thoughts?

Answer 1

As you can see on heroku docs: add this to your config.ru:

$stdout.sync = true

Don't forget the $ before stdout or it won't work.